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  2. Pale Blue Dot (book) - Wikipedia

    en.wikipedia.org/wiki/Pale_Blue_Dot_(book)

    The first part of the book examines the claims made throughout history that Earth and the human species are unique. Sagan proposes two reasons for the persistence of the idea of a geocentric, or Earth-centered universe: human pride in our existence, and the threat of torturing those who dissented from it, particularly during the time of the Roman Inquisition.

  3. Discovery and exploration of the Solar System - Wikipedia

    en.wikipedia.org/wiki/Discovery_and_exploration...

    In ancient and medieval times, only objects visible to the naked eye—the Sun, the Moon, the five classical planets, and comets, along with phenomena now known to take place in Earth's atmosphere, like meteors and aurorae—were known. [dubious – discuss] Ancient astronomers were able to make geometric observations with various instruments.

  4. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    Earth's hydrosphere is the sum of Earth's water and its distribution. Most of Earth's hydrosphere consists of Earth's global ocean. Earth's hydrosphere also consists of water in the atmosphere and on land, including clouds, inland seas, lakes, rivers, and underground waters.

  5. Observable universe - Wikipedia

    en.wikipedia.org/wiki/Observable_universe

    The observable universe is a spherical region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion.

  6. Copernican principle - Wikipedia

    en.wikipedia.org/wiki/Copernican_principle

    He argued that the apparent retrograde motion of the planets is an illusion caused by Earth's movement around the Sun, which the Copernican model placed at the centre of the universe. Copernicus himself was mainly motivated by technical dissatisfaction with the earlier system and not by support for any mediocrity principle .

  7. Buddhist cosmology - Wikipedia

    en.wikipedia.org/wiki/Buddhist_cosmology

    The Buddhist cosmology is not a literal description of the shape of the universe; [2] rather, it is the universe as seen through the divyacakṣus (Pali: dibbacakkhu दिब्बचक्खु), the "divine eye" by which a Buddha or an arhat can perceive all beings arising (being born) and passing away (dying) within various worlds; and can ...

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